[tree-ssa] Insert on edge comment

[law@redhat.com]

In message <1054566811.3054.150.camel@p4>, Andrew MacLeod writes:
 >On Sat, 2003-05-31 at 22:01, law@redhat.com wrote:
 >> In message <Pine.LNX.4.44.0305311132300.22731-100000@nondot.org>, Chris Lat
 >tner
 >>  writes:
 >>  >IMO, the real problem in tree-ssa is that it uses a nested control flow
 >>  >structure instead of a linearized one...
 >> Amen.  It's a model I'd like to move away from, it introduces a fair
 >> amount of complexity.  However, it's pretty far down on the list of
 >> things to do right now, but it's definitely on my list.
 >> 
 >Well,  the longer it left, the more impossible it becomes to remove...
 >So if there is a plan or thought to change it, it ought to be sooner
 >rather than later...  
I agree absolutely.  My concern is I think we've done enough major work
underneath at this time -- the more underlying stuff we redesign and
reimplement, the longer this process takes -- and as you know, we have
some deadlines looming :-)

Now it may turn out that it will be convenient to tackle this while we're
dealing with the performance issues (because we know we're going to be
spending some time cleaning up the tree->rtl conversion process).  If
things turn out that way, well, we'll have to deal with it at that time.


Jeff